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これはおそらく、すべてDATEが運ぶ時間の部分のためです。それを取り除くには、trunc関数を使用します。
DATE
select trunc(reg_date), count(trunc(reg_date)) from reg where reg_date >= to_date('01-JAN-12', 'DD-MON-YY') group by trunc(reg_date)